• 关键词：氮  循环  模型  富营养化

• 基金项目：

• 戴树桂
• 南开大学环境科学系, 天津

• 张明顺
• 南开大学环境科学系, 天津

• 庄源益
• 南开大学环境科学系, 天津

• 摘要：研究了NO₃^--N,NH₄⁺-N在底泥中的扩散、吸附以及NO₃^--N的反硝化等过程.结果表明,在泥-水界面间,NH₄⁺-N主要向上浮水中扩散,NO₃^--N主要向间隙水中扩散.扩散到间隙水中的NO₃^--N45％被吸附,30％因反硝化作用而失掉,其反硝化速率常数在7—11cm层最大.氮的吸附速率常数在表层最大.建立了间隙水中NO₃^--N和NH₄⁺-N的转化模型,并计算了氮在泥-水界面间的扩散量,计算结果与实测结果基本相符.

• Abstract：The diffusion and the adsorption of NO₈-N and NH₄-N and the denr-trification of NO₈-N in sediment were studied. NH₄-N diffused cross the interface of water-sediment into the water column while NO₈-N transferred in another direction.In interstitial water,45 percent of NO₈-N from overlying water was adsorbed and 30 percent was lost during denitrifica-tion. The denitrification rate constant of NO₈-N reached its maximum between 7-11 cm of the sediment and the maximum adsorption occurred in the top few centimeters of the sediment. Transport models of NO₈-N and NH₄-N in interstitial water were suggested and applied to calculate the amounts of nitrogen transferred cross the interface.

• Key words：nitrogen  sediment  mass transfer.

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